Grate for furnaces.



UNITED STATES PATENT OFFICE..

ROBERT S. MAYER, OF CINCINNATI, OHIO, ASSIGNOROF TVO-THIRDS TO IIARRIED. CRANE AND ANTON MAYER, OF SAME PLACE.

GRAT FOR FURNACES.

SPECIFICATION forming part of Letters Patent No. 645,921, dated March20, 1900.

Application iiled December l, 1899. Serial No. 738,882. (No model.)

which the following 'is a specification, refer-- ence being had thereinto the'accomp'anying drawings. Y Y v My invention relates to grates forfurnaces;

and its object is to provide improved means for supplying air tothefurnace to aid 'combustion.

The construction'of the improved grate will` be fully describedhereinafter inl connection with the accompanying drawings, which form apart of this specification, and its -novel features will be defined inthe appended claims.

In the drawings, Figure 1 is a sectional side elevation of afurnace-grate embodyingthe invention. Fig. 2 is a plan view of the same.Fig. 3 is a transverse section, and Figs. 4 and 5 illustrate parts indetail. v

The reference-numeral 1 designates a rectangular box or casingconstituting an airchamber and provided at one end with an opening 2 forthe admission of air from any suitable blower or like source. Thisair-chamber 1 is located upon the bridge-wall 7 of the furnace. v

3 designates hollow grate-bars, the inner ends of which communicate withthe air-chamber 1, while their forward ends rest upon asupporting-bracket 4, secured transversely within the front of thefurnace. Between the outer ends of the grate-bars Sand their support 4is interposed a slide 5, formed with openings S, corresponding to theopenings in the ends of the grate-bars 3 and adapted to registertherewith when the slide is moved to the proper position by means of`its handle 9.

The cross-sectional contour of the bars 3 is shown in Fig. 3. The uppersurface of each ba-r is flat at its center 10 and beveled or inclined iuoppositefdirections at each side of the center, as shown at 11. The barsare also formed with perforations 12 for the passage of air.l

v Alternating with the hollow or tubular bars 3 I employ open grate-bars6,'each comprising a central body portion 13, from which project onopposite sides parallel fingers 14, the upper'surfaces of which' areinclined.

The operation and-utility ofthe construction above described willbereadily understood. When the Iire is started, the slide 5 is moved toclose the front endsrof the t`ubu lar bars, the open bars supplyingsulicient air for starting the fire. Air is then supplied to theair-chamber 1 and passes through the perforations in the tubular bars tothe fire.

Thus the vfire can be regulated and a substantially complete combustionof the fuel obtained.

1. In a furnace-grate, the combination with an air-chamber supportedupon the bridgewall of the furnace, ofa series of hollow per--` foratedgrate-bars having their inner ends communicating with the air-chamber;open grate-bars alternating with the tubular bars; and a slide forclosing the front ends of the hollow bars.

2. In a furnacegrate, the combination with W. F. NORTH, JAMES M. BRANDT.

